A superhero X from DC universe and a superhero Y from Marvel universe determined to hitch arms and cease a cybercriminal. They named this operation as ‘Uncaged’ as a codeword for ‘Coding’.

“I’ll choose a superhero from my universe to help me. You too choose a superhero out of your universe to help you” mentioned X.

“Sure. Let us all change our names to codewords much like how our operation is called” replied Y.

“That’s a good suggestion. I’ll message you tonight after selecting my companion. You too determine your companion by that point” concluded X.

Later that night time, X messaged Y:
“Hi Cabrio, I’ve chosen Heritor as my companion for this operation.“

Y replied:
“Hi Cabrio, I’ve chosen Cleanout as my companion for this operation.“

Who are the 4 superheroes concerned on this operation?

How are the codewords derived?